A friend had a startup that did this for nightclubs so you could see which club was really going hot and which was dead. He got a couple of places to sign up but think ultimately it failed to gain traction because no nightclub wants potential customers to know ahead of time that it's dead inside.
You could achieve this by selectively showing what it was like last Friday night at 1am instead of a live view at 8pm when nothing is happening but people are deciding...
